In the process of getting my wireless USB dongle (trendnet tew-424ub) to work, and for a while there it was going quite well. Followed the instructions in the Ubuntu wiki. Got it to work with WEP. Then went to reboot to make sure it would start it (ndiswrapper) up at boot time.
Lo and behold, wlan0 was no longer in the network panel at all, and when i tried to modprobe ndiswrapper, it gave be a fatal error:
FATAL: Error inserting ndiswrapper (/lib/modules/2.6.12-10-386/kernel/drivers/net/ndiswrapper/ndiswrapper.ko): Operation not permitted
I don't at all understand how I could have done just this same command before I rebooted and it worked, but now it fails.
Sincerest gratification to anyone who helps me with this. It's aggravating to not get it to work, but it's worse when you had it working and now it doesn't.